期刊
PLANT AND SOIL
卷 333, 期 1-2, 页码 325-336出版社
SPRINGER
DOI: 10.1007/s11104-010-0348-8
关键词
N; Fine root biomass; Soil microbial biomass; Soil respiration; Fine root specific respiration
资金
- Natural Science Foundation of China [30130160, 40801071]
- Doctoral Research Foundation in Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences [O8H2041]
The response of belowground biological processes to soil N availability in Larix gmelinii (larch) and Fraxinus mandshurica (ash) plantations was studied. Soil and root respiration were measured with Li-Cor 6400 and gas-phase O-2 electrodes, respectively. Compared with the control, N fertilization induced the decreases of fine root biomass by 52% and 25%, and soil respiration by 30% and 24% in larch and ash plantations, respectively. The average soil microbial biomass C and N were decreased by 29% and 42% under larch stand and 39% and 47% under ash stand, respectively. While the fine root tissue N concentration under fertilized plots was higher 26% and 12% than that under control plots, respectively, the average fine root respiration rates were increased by 10% and 13% in larch and ash stands under fertilized plot, respectively. Soil respiration rates showed significantly positive exponential relationships with soil temperature, and a seasonal dynamic. These findings suggest that N fertilization can suppress fine root biomass at five branch orders (< 2 mm in diameter), soil respiration, and soil microbial biomass C and N, and alter soil microbial communities in L. gmelinii and F. mandshurica plantations.
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